xml操作

添加记录到ds保存到xml            
DataSet ds = new DataSet("myDs");
            //从XML中读取数据
            ds.ReadXml(Server.MapPath(@".dbdbGuest.xml"));
            //以下为添加记录
            DataRow dr = ds.Tables[0].NewRow();
            dr["Name"] = tbName.Text.Trim();
            dr["City"] = tbCity.Text.Trim();
            dr["Email"] = tbEmail.Text.Trim();
            dr["Message"] = tbComments.Text.Trim();
            dr["STime"] = DateTime.Now.ToString();
            ds.Tables[0].Rows.Add(dr);
            //写回XML
            ds.WriteXml(Server.MapPath(".\db\dbGuest.xml"));
 用ds显示xml
DataSet ds = new DataSet();
            ds.ReadXml(Server.MapPath(@".dbdbGuest.xml"));
            dgShow.DataSource = ds.Tables[0].DefaultView;
            dgShow.DataBind();
 xml添加到ArrayList
<?xml version="1.0" encoding="utf-8" ?>
  <PEOPLE>
    <PERSON>张三</PERSON>
    <PERSON>李四</PERSON>
  </PEOPLE>
    XmlDocument doc = new XmlDocument();
   &